Celltrion Inc. received FDA approval for Steqeyma (ustekinumab), a biosimilar of Stelara, for psoriasis vulgaris, psoriatic arthritis, Crohn's Disease, and Ulcerative Colitis in the US. The drug is already approved in South Korea, Europe, the UK, Canada, and other countries. Celltrion anticipates finalizing a patent settlement to enter the US market by February.